Rotary pump



(No Model.)

B. LEAOH.

ROTARY PUMP.

No. 445,318. Patented Jan. 27, 1891.

Fig". 3

W/T/VESSES: I/VVEIVTOR @214, i BY 'gWM/L Arm/Mk7 UTTE STATES PATENT OFFICE.

RUFUS LEACH, OF CLARKS ISLAND, ASSIGNOR OF FIVE-EIGH'IHS TO EDIVARD A. BUCK AND ALBION G. BATOHELDER, OF BANGOR, MAINE.

ROTARY PUMP.

SPECIFICATION forming part of Letters Patent No. 445,318, dated January 2'7, 1891.

Application filed December 20, 1888- Serial No. 294,170. (No model.)

To ctZZ whom it may con ern: as shown by the arrows in Fig. 1. These Be it known that I, RUFUS LEACH, a citizen openings E and G in the wall N of my pump of the United States, residing at Olarks may be situated anywhere upon the same, it Island, St. George,in the county of Knox and making no material difference where they are 5 State of Maine, have invented anew and uselocated, and either may be used for induction ful Rotary Pump, and I do hereby declare or eduction orifices; but in the present case that the following is a full, clear, and exact I have shown their entrance into the wall of description of the invention, which will enthe shell at very near a tangent to its circular able others skilled in the art to which it apinterior, which situation I find as effective as IO pertains to make and use the same. any. The interiorof the eircularwallNfornr My invention relates to rotary pumps; and ing part of the shell of my pump is bored out it consists in the improved construction of the to a radius equal to one-half of the length of same, aswill be hereinafter more particularly the long diameter of the elliptical drum 0, described, and pointed out in the claim. into which the latter is fitted and rotated. 15 Throughout the description reference is The thickness of the said drum determines made to the accompanying drawings, in the width or the wall N, and also determines which the capacity of the pump when taken in con- Figure 1 represents a vertical longitudinal junction with the diiference between its long section of my improved pump showing its inand short diameters. This exactcorrespond- 7o 20 terior construction. Fig. 2 is an isometric ence between the inner diameter of the cirview of the sliding abutment used in my pump. cular wall N and the greatest diameter of the Fig. 3 is a vertical cross-section of my imdrum C effectually cuts off the lower part of proved pump out through the dotted line y 3 the interior of the casingfrom the upper part of Fig. 1",and'showing the same relative posithereof when the drum is in the position 25 tion of its internal parts as represented in the shown in Fig. 1. The advantage of this confirst figure. struction will be hereinafter set forth in de- Similar letters of reference refer to correscribing the operation of the machine.

spondingly like parts throughout the differ- The side plates A A are made of suitable out views. size and shape to cover each side of the cir- 8o 0 C designates a drum of elliptical shape cencular wall N, to which they are bolted or othtrally mounted on a shaft S and rotating erwise secured, water or air tight. These side therewith inside of an inclosing casing havplates have a central hole drilled through ing a circular wall N, the inner diameter of each, through which the shaft S passes, and which is equal to the length of the greatest they may be cast with a boss around these 5 diameter of said drum. This drum C is conshaft-openings which can be threaded and a structed with parallel sides. Its elliptical surhollow nut It turned thereon, forming a stuffface or periphery is planed at right angles to ing-box around the shaft S, as shown in Fig. itssides, and one of the latter is provided with 3, if desired, in this case forming air-tight a concentric groove (Z of sufficient size and journals around the said shaft. Though for 4o depth to admit a small roll 6, attached to one ordinary pumping, such as water alone, I do leg of the sliding abutment B, as willbeherenot consider it absolutely necessary to coninaft-er explained. At opposite ends of the struet such air-tightboxes, as the sides A A transverse axis of the elliptically-shaped drum bear closely upon the revolving drum 0, and C are out small grooves a a, running transfitting so snugly to the latter will make it im- 5 .5 versely across its surface at these points and possible for water to pass between them to adapted to be filled with and hold packing. enter the journals, in which case a simple This drum C is situated within a shell eonjournal-box consisting ofahole bored through sisting of two side plates A A, separated by the sides A A the same size as the shaft S a circular wall or partition N, provided with will answer the purpose. 10g

50 two openings or apertures E and G, one used Situated between the inlet and outlet openfor ingress and the other for egress orifices, ings E and G is an abutment B, arranged to slide radially in a direct line from the center of the shaft S. This abutment forms a partition between the openings E and G, and itis provided with two legs and c, which project downward from each end. These legs may be formed in one piece With the abutment, or made separate and bolted to each end of the latter, as shown in Fig. 3 of the drawings,

' and the distance between the legs 0 c is equal to the width of the drum 0, which revolves between them, and the under edge of the abutment, where it bears upon the surface of the said drum, is provided with a longitudinal slot, which is filled with packingf, to increase its frictional contact.

In order to hold and allow the abutment B, which is a little longer than the distance between the two sides A A, to slide within the latter, a radial groove 11 (partly shown in Fig. 3) is planed in the interior surface of each side A at this place the depth and thickness of the legs 0 and 0'. These grooves are of sufficient length to allow the lower edge of the abutment to rest upon the surface of the chip tically-shaped drum 0 at all positions of the latter, and to. maintain a constant contact upon the same. One leg 0 of the said abutment is provided with a small roller 6, attached thereto by means of a bolt passing therethrough, upon which it turns.

The roller 6 projects inward at right angles from the leg 0, and its size is governed by the size of the concentric groove d in the drum (3, within which it rotates, by means of the revolutions of the said drum. It thereforeis situated upon the leg 0 the same distance from the lower edge of the abutment as the interval between the surface of the drum C and the concentric groove (1 cut in its side.

To provide a sufficient distance for the abutment B to slide within the interior of the pump without projecting through the wall N, the latter is cast with an extension H projecting above its circular exterior, and con- [taining continuations of the grooves b b in the sides A to allow and permit the reciprocation of the said abutment.

A cap I is bolted to and extends over the top of the extension H to prevent the outlet of the liquid being pumped, provided any should happen to work through.

The operation of my improved rotary pump is as follows: The shaft S having been connected with some suitable power medium is revolved thereby, turning the elliptical drum 0 within the circular chamber of the shell. The packing in the ends of the drum rubbing upon the interior of the wall N causes a vacuum and creates a suction through the inlet of the chamber. If the drum is revolved from right to left, as shown in Fig. 1

of the drawings, a suction will be formed in the direction of the arrows through the inlet E, and behind the sliding abutment B. The opposite end of the drum, which isalso suitably packed, forces the air before it against the sliding abutment B, and out through the egress-openin g G, the abutment B in the meantime being kept in contact with the elliptical surface of the drum by means of the roller 6, attached to one of its legs 0, turning in the concentric groove cl, as hereinbefore described. As the opposite end of the drum rises toward the abutment it forces the latter upward in the grooves 19 b in the sides A A, and at the time there is the greatest pressure but a small portion of the abutment is in contact with that pressure. hen the long diameter of the elliptical drum passes by the said abutment, this end commences to draw through the ingress-opening, and the opposite end forces the liquid. through the egressorifice, and at the time the suction end passes by the ingress-opening it cuts off the suction of the opposite end and the space F between the two is filled with compressed liquid, thus making the pressure equal each side of the forcing end of the drum, greatly relieving the same, forming a cushion, as it were, by keeping a constant even pressure upon the power medium. Thus the pump is run smooth and without the disagreeable jerky movement common to a great many.

Having thus described myinven tion, what I claim, and desire to secure bylletters Patent of the United'States, is

In a rotary pump, the zombination, with the casing consisting of the centrally-perforated side plates, each having a radial. groove extending from near the perforation to the circumference, and a circular wall between the plates having an inlet and an outlet opening substantially at a tangent to the ring. and a slotted portion between the inlet and outlet openings, which extends from the inner diameter out beyond the exterior diameter, said slot registering with the grooves in the side plates, of a shaft through the casing, an elliptical drum on the shaft, the length of which is equal to the diameter of the casing, and having a groove in one side, a flat abutment in the slotted portion of the ring of a greater length than the width of the drum, and a leg on each end of the abutment, which fits within the grooves in the side plates, and one of which is provided with a roller which fits within the groove in the side of the drum, substantially as described.

RUFUS LEAOH.

W itnesses:

ALBION C. BATOHELDER, EDWARD A. BUCK. 

